Tkabber is a GPL instant messaging client for the Jabber (XMPP) protocol which uses the Tk toolkit for the GUI. More »

SIM-IM is a multiprotocol instant messaging application, which supports serverless and serverbased messenger protocols. More »

SIP Communicator is an audio/video Internet phone and instant messenger that supports several popular instant messaging and telephony protocols, including SIP, Jabber, AIM/ICQ, .NET Messenger Service (MSN), Yahoo! Messenger, Bonjour, IRC and RSS. More »

Psi is a GPL instant messaging client for the Jabber (XMPP) protocol which uses the Qt toolkit. It runs on Linux, Microsoft Windows, and Mac OS X. More »

Pidgin is a multi-platform instant messaging client, based on a library named libpurple. Libpurple has support for many commonly used instant messaging protocols, allowing the user to log into various different services from one application. More »